diff --git a/awx/ui/static/js/helpers/search.js b/awx/ui/static/js/helpers/search.js
index b8bdb75359..8ed54c0644 100644
--- a/awx/ui/static/js/helpers/search.js
+++ b/awx/ui/static/js/helpers/search.js
@@ -401,6 +401,9 @@ angular.module('SearchHelper', ['RestServices', 'Utilities', 'RefreshHelper'])
                             } else if (list.fields[scope[iterator + 'SearchField' + modifier]].searchType &&
                                 list.fields[scope[iterator + 'SearchField' + modifier]].searchType === 'gtzero') {
                                 scope[iterator + 'SearchParams'] += 'gt=0';
+                            } else if (list.fields[scope[iterator + 'SearchField' + modifier]].searchType &&
+                                list.fields[scope[iterator + 'SearchField' + modifier]].searchType === 'isnull') {
+                                scope[iterator + 'SearchParams'] += 'isnull=';
                             } else if ( (list.fields[scope[iterator + 'SearchField' + modifier]].searchType === 'select') &&
                                 Empty(scope[iterator + 'SearchSelectValue' + modifier].value) && !/\_\_$/.test(scope[iterator + 'SearchParams']) ) {
                                 scope[iterator + 'SearchParams'] += '=iexact=';
diff --git a/awx/ui/static/js/lists/Streams.js b/awx/ui/static/js/lists/Streams.js
index 2afd7d5e08..480c17eec2 100644
--- a/awx/ui/static/js/lists/Streams.js
+++ b/awx/ui/static/js/lists/Streams.js
@@ -47,12 +47,10 @@ angular.module('StreamListDefinition', [])
                 searchable: false,
                 columnClass: 'col-lg-7'
             },
-            system_event: {
+            actor: {
                 label: 'System event',
                 searchOnly: true,
                 searchType: 'isnull',
-                sourceModel: 'actor',
-                sourceField: 'username',
                 searchWidget: 1
             },
 
@@ -264,5 +262,5 @@ angular.module('StreamListDefinition', [])
                 dataPlacement: 'top'
             }
         }
-        
+
     });
\ No newline at end of file